Cooling machine



FIG. 1 shows a top and front perspective view of my design for a cooling machine;

FIG. 2 is an enlarged fragmented rear perspective view thereof; and,

FIG. 3 is an enlarged fragmented front perspective view thereof.

The undisclosed sides that are not shown in the drawings form no part of the claimed design. 

The ornamental design for a cooling machine, as shown and described. 